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Methods to upgrade & migrate to esxi5.0

There are over all three methods to upgrade to ESXi5.0. There are listed below

1. Perform a scripted upgrade

You can upgrade or migrate hosts from version 4.x ESXi and ESX to ESXi 5.0 by invoking an update script, for an efficient, unattended upgrade. Scripted upgrades provide an efficient way to deploy multiple hosts. You can use a script to upgrade ESXi from a CD, DVD or USB flash drive, or by PXE-booting the installer. You can also call a script from an interactive installation.

You can run the ESXi 5.0 installer from a CD/DVD or USB flash drive to do an interactive upgrade or migration.The installer works the same as for a fresh installation, but if you select a target disk that already contains an ESX/ESXi 4.x installation, the installer upgrades the host to 5.0, and gives you the option to migrate some existing host settings and configuration files, and preserve the existing VMFS datastores.